1.  High frequency transmit and receive system, use precise surface patch component design make stable quality not influenced by weather temperature condition, long control distance with a cover on transmitter to avoid pressing unexpected, left or right installation switch button .

2.  Install alarm system and alarm buzzer to the doors and windows, after we set the alarm system .if someone try to open shutter manually .the buzzer will sound and other people will be noticed to bring security to your shop ,house and store.

3.  Install button millstone rubber and rebound system door will rebounds. To the top when meet obstacle in down moving, if add alarm buzzer will support alarm system function.

4.  Install infrared sensor, door will rebounds to the top when infrared line block by obstacles.

5.  If add alarm system and alarm buzzer ,will get alarm system function.